-
Article type: Cover
1994 Volume 59 Issue 460 Pages
Cover16-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1994 Volume 59 Issue 460 Pages
Cover17-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1994 Volume 59 Issue 460 Pages
App18-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1994 Volume 59 Issue 460 Pages
Toc6-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1994 Volume 59 Issue 460 Pages
App19-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1994 Volume 59 Issue 460 Pages
App20-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Yoshihisa NAKATA, Yoshio KASAI, Isamu MATSUI, Noboru YUASA
Article type: Article
1994 Volume 59 Issue 460 Pages
1-10
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
In general, the cement content of hardened concrete is tested by means of dissolving cement paste with hydrochloric acid, however, hydrochloric acid dissolves sea shell contained in sea sand and lime stone as aggregate in addition to cement paste. Therefore, the tested cement content is apt to estimate greater than actual cement content. The sodium gluconate solution dissolves only cement in concrete, it is hard to dissolve sea shell, lime stone and carbonated concrete. The effects of the concentration and temperature of sodium gluconate solution, insolubility of lime stone and ignition loss of cement on the cement content were investigated to establish a test method. From the results of these tests, the test method for cement content of hardened concrete by sodium gluconate is proposed. The test method can estimate the cement content of hardened concrete within the range of ±10% to the designed unit cement content
View full abstract
-
Kyoji TANAKA, Hiroshi HASHIDA, Naoto HASHI
Article type: Article
1994 Volume 59 Issue 460 Pages
11-18
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The method, which is based on a mercury intrusion technique, was developed to measure the porosity of mortar specimens partially containing moisture in their pores. The results obtained through the method were compared with pore size in which water condenses calculated by the Kelvin's equation and total pore volume measured by a volumetric method, then the validity of them was discussed. It was made clear from the measurement of mortars at early ages during drying that diameters of pores filled with liquid water become smaller and volumes of them decrease.
View full abstract
-
Shinji KAWABE, Tatsuo OKAJIMA
Article type: Article
1994 Volume 59 Issue 460 Pages
19-25
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The purpose of this study is to obtain the effect of water content on thermal expansion of plain concrete under multi-axial constant stress conditions. The conclusion is the following ; The thermal expansion of pre-heated concrete between 20℃ and 100℃, under constant compressive stress including tri-axial loading in which maximum compressive stress is below the one third of strength, can be concluded to be equal to the sum of elastic deformation caused by external forces and by the thermal expansion without external load. But the thermal expansion of air dried and water saturated concrete is smaller than that of free expansion. The strain of these concretes can be obtained as the sum of elastic deformation, free thermal expansion and creep strain. The creep strain of concrete at any temperature can be obtained by using "Time Temperature Equivalence Principle."
View full abstract
-
Hidenori ONO, Soo Kyung CHOI
Article type: Article
1994 Volume 59 Issue 460 Pages
27-35
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The purpose of this study is to establish an evaluation method of fracture of framed floors and walls by human dynamic force. In this paper, part 1, we analysed human dynamic force applied to framed floors and walls. At first, we made original measuring equipment of dynamic force, and carried out the experiment on human dynamic force in various actions. After the experiment, we extracted the essential charactristics, namely, maximum load(L_<t1>), contact time(t_1), and the action velocity(d・to^<-1>). And we grasped the property of human dynamic force systematically based on the relation between L_<t1> and L_<t1>・t_1^<-1>, L_<t1> and d・t_0^<-1>. Finally, we presented that the property of force by standard test methods and the data in the past study on dynamic force are quite different from the actual human dynamic force.
View full abstract
-
Yoshimitsu FUKUSHIMA, Saburoh MIDORIKAWA
Article type: Article
1994 Volume 59 Issue 460 Pages
37-46
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
Empirical relations for frequency dependent Q^<-1> values of ground strata are derived from the previous observations. Amplification factors of ground are calculated by the multiple reflection wave propagation theory using the relation of frequency dependent Q^<-1>. Average amplification factors for individual geomorphological classifications agree well to those derived from strong motion records. Further, relations between average S-wave velocity of surface strata and the amplification factor calculated using the frequency dependent Q^<-1> agree well to the relations from the records.
View full abstract
-
Takafumi MIYAMA, Hiroshi AKIYAMA
Article type: Article
1994 Volume 59 Issue 460 Pages
47-55
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The total energy input exerted by an earthquake is a very stable amount which is mainly influenced by the total mass and the fundamental natural period of structure. If the energy is concentrated in a limited part of the structure, other parts remain in an elastic state, and the evaluation of the seismic safety becomes clear. When the top story of the multi-story frames is sufficiently weaker than the other stories, the damage can be concentrated in the top story, and other stories is undamaged. This paper investigates the relationship between the restoring force characteristics of the top story and the responses of the building under earthquakes in terms of damage concentration. The design condition is made clear under which the damage can concentrate in the top story without suffering excessive story displacement.
View full abstract
-
Koji UETANI, Masami KOBAYASHI
Article type: Article
1994 Volume 59 Issue 460 Pages
57-67
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
An extended theory of the symmetry limit is presented for a three-dimensional continuum model subjected to completely reversed cyclic loading. The present theory is developed for elastic perfectly plastic solids obeying the flow theory of plasticity and is limited to shakedown regions. Relations between stress rates and strain rates associated with the incremental variation of steady-state are derived according to the similar procedure to the derivation from uniaxial material laws presented by the senior author. Equations for symmetric and anti-symmetric components of steady-state are derived by the formulation employing a pair of coordinate systems located symmetrically with respect to the initial central plane of the analytical model.
View full abstract
-
Yoshio WAKAME, Akira ENAMI, Masato MAJIMA, Toshiaki NAGAO
Article type: Article
1994 Volume 59 Issue 460 Pages
69-76
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
We developed calculation method to predict foundation settlement on the ground reinforced by slender steel pipes. In this method, contact load of foundation slab and load of pile are considered separately. Settlement of foundation slab and slender piles be calculated using Steinbreener's Solution and Mindlin's Solution. The simple equation can be derived assuming that foundation slab are rigid and each pile load are equal to same value. To verify the method for its validity, simulation analyses were carried out. As a result of simulation , not only settlement of foundation slab but also pile load are approximate agreement with test results.
View full abstract
-
Motohide TADA, Mariko HAYASHI
Article type: Article
1994 Volume 59 Issue 460 Pages
77-82
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The force limiting devices in the double-layer space trusses not only prevent the member to buckle but also absorb the considerable amount of the seismic energy. This paper deals with the seismic design procedure of double-layer space trusses using force limiting devices. The proposed procedure is based on the energy balance between the seismic energy and the energy absorbed in the force limiting devices. The designed space truss is dynamically analyzed and the best performance under the vertical seismic motion can be successfully obtained.
View full abstract
-
Osamu MATSUOKA, Koji YAMADA, Tetsuya MATSUI, Hiroshi OHMORI
Article type: Article
1994 Volume 59 Issue 460 Pages
83-91
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
This paper deals with an axisymmetric bending problem of a closed cylindrical shell. The governing equations for three-dimensional linear elastic theory are solved exactly by means of a separation of variable method in cylindrical coordinates. The problem is reduced to finding the characteristic values satisfying the free surface boundary condition along the shell surfaces. The solutions corresponding to these characteristic values are then combined to satisfy completely the constraint conditions across the shell cross section at the longitudinal edges. Through comparison with the present solution, it is shown that shell theory is useful for such a thick shell as with a radius to thickness ratio of 4.
View full abstract
-
Masanori KAWAJI, Kohya SAKAJIRI, Yoshizo DOBASHI
Article type: Article
1994 Volume 59 Issue 460 Pages
93-102
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The authors of this report used yield line theory that accounts for compressive membrane stress to derive an ultimate load bearing capacity analytical formula for slabs with orthogonal slab bands, and experimentally verified its suitability. The report describes a comparison with a floor slab of a slab with one-way midspan slab bands performed using model slabs, and explains the deformation bearing stress charactetistics of the slabs with orthogonal slab bands.
View full abstract
-
Junji OGAWA, Junichi SHIBUYA, Yoshihiro ABE, Michio HOSHI
Article type: Article
1994 Volume 59 Issue 460 Pages
103-112
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
Cantilever-type column specimens of precast shell concrete (PCa) and monolithic reinforced concrete (RC) were designed to simulate the hinge zone of the column. Specimens are subjected to the static uni-axial reversals and the static bi-axial circle path loading. The cover concrete spall off and the exposure of reinforcement started at extreme compressive strain of 2% and at a drift angle of 5/100 in the uni-axial loading and 2.5- 3.5/100 in the circle path loading for PCa specimens, and at 2.5-3.5/100 in the uni-axial loading and 1.5-2/100 in the circle path loading for RC specimens. The bi-axial loading gives more serious damage to the concrete columns than the uni-axial loading. This is interpreted by the high compressive strain distribution of the column section. Due to high strength concrete outer shell, PCa specimens show about 20% higher strength than RC specimens. The fiber model analysis can simulate the experimental results.
View full abstract
-
Kimiya HAMADA, Hiroyuki KAWAMURA
Article type: Article
1994 Volume 59 Issue 460 Pages
113-122
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
In this Report, the authors have described the following matters from the shear tests of three types specimens to investigate the shear strength of anchor bolts in a dented bore of the concrete with filling cement mortar. 1. In the case that the basic concrete is conically failured, the shear strength of the anchor bolt can be estimated by making assumption of the stress distribution on the failure surface. 2. In the case that the steel bolt yields in bending moment, the shear strength of the anchor bolt can be estimated by the empirical equation obtained as the function of the bending strength and the diameter of the steel bolts. 3. In the case that the segregation fracture occures at the covered part of the basic concrete, the shear strength of the anchor bolt can be estimated from the failing area by making assumption of the failure surface. 4. The resisting mechanism and the dynamical properties of the anchor bolt in a dented bore of concrete with filling cement mortar are same as the pre-installed anchor.
View full abstract
-
Takayuki FUJIMOTO
Article type: Article
1994 Volume 59 Issue 460 Pages
123-129
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
This paper discusses the experimental results of reinforced concrete slab strips whose circular hollows are arranged perpendicularly to the logitudinal direction. In this paper, a series of slab strips were tested under the conditions of no shear reinforcement and short term loading in a very stiff surrounding frame. The experimetal results showed that the hollow slab strips of this type tends to produce shear failure and the failure phenomena are very complicated due to stress concentration effect. The author analyized these shear failure phenomena and showed that the failure modes can be explained by simple calculations.
View full abstract
-
Toshio ASAKAWA, Rintaro ISHIMARU, Hiroshi YOSHIDA, Yasuyoshi SUENAGA
Article type: Article
1994 Volume 59 Issue 460 Pages
131-141
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
This study is initiated to provide data for the proposed eleven storey precast concrete wall structure reducing to columns at the ground storey, where is intended to use for shopping store and parking garage. This structure essentially consists of multi-storey shear walls assuming a single rigid mass above a flexible lower storey at transverse direction so it might qualify as two storey building. The most structually efficient sollusion is that RC columns should be confined with rectangular steel pipe at the ground storey. The first experimental investigation for columns carried out to assess the inelastic progress in flexural failure under fluctuation of axial force and considerable improvement in the ultimate shear capacity. The second experimental investigation for one-four scale frame specimens of lower two storey carried out to ensure the inelastic behaviour under actual fluctuation of axial force and bending moment on columns at the ground storey.
View full abstract
-
Toshio ASAKAWA, Rintaro ISHIMARU, Hiroshi YOSHIDA, Yasuyoshi SUENAGA
Article type: Article
1994 Volume 59 Issue 460 Pages
143-152
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
This study is initiated to provide data for the proposed eleven storey precast concrete wall structure reducing to columns at the ground storey, where is intended to use for shopping store and parking garage. This structure essentially consists of multi-storey shear walls assuming a single rigid mass above a flexible lower storey at transverse direction so it might qualify as two storey building. The most structually efficient sollusion is that RC columns should be confined with rectangular steel pipe at the ground storey. The objective of this study is to develope the lower structure may be capable of satisfactory behaviour under seismic loading. An experimental investigation for columns confined with steel pipe carried out to assess the considerable improvement in the ultimate shear capacity and to propose the advanced theory for the shear strength.
View full abstract
-
Masayoshi ITO, Satoru INO, Akira SUGINOME, Takeyoshi UEMATSU
Article type: Article
1994 Volume 59 Issue 460 Pages
153-160
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The degree of human perception of vibration of floor slabs generally is estimated in terms of major vibration criteria, natural vibration period Ti and amplitude 8. As for f we have already proposed regression equations for it as a function of long-time floor deflection, which were derived from systematic analyses of our so far accumulated field data; thus enabling direct and simple estimation of Ti using long-time floor slab deflection obtainable by any standard method. Currently, resulting from further analysis using the same data, a strong functional relation has proved to exist between those Ti and 6 caused by walkers. Accordingly, our last and present formulation combined may enable us to quantify human perception of floor vibration approximately by available vibration evaluation curves such as Meister1 s which use both of the said criteria.
View full abstract
-
Fumiya ESAKI
Article type: Article
1994 Volume 59 Issue 460 Pages
161-168
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
The lateral initial rigidity, first cracking load, lateral deformation at first cracking load of high-strength R/C framed shear walls were investigated by employing the experimental data. Also, based on the shear buckling strength of the cracked wall panel the critical thickness of wall rpanel was investigated. The investigation concludes that the flexural cracking load of high-strength shear walls is well estimated by the equation for the normal-strength ones, but in the case of the shear cracking load of high-strength shear walls the effect of vertical load must be considered unlike the case of normal-strength ones. Also, it is recommended that the thickness of wall panel is thicker than 1/25 of the clear height of wall panel.
View full abstract
-
Takashi HASEGAWA, Hiroyuki YAMANOUCHI
Article type: Article
1994 Volume 59 Issue 460 Pages
169-177
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
This paper tries to determine analytically the required inelastic deformation capacity of steel structural members on the basis of damage distribution in steel building frames subjected to strong earthquake ground motions. The major parameters of the analyses are : l)panel yield ratio, 2) column/beam strength ratio, 3)second slope of hinges of joint panel and 4)base shear coefficients of frames. A series of dynamic time-history response analyses was carried out in order to investigate the influence of the above parameters on damage distribution in steel frames. From the results of the analyses, it was found that the required inelastic deformation capacity of steel members strongly depends upon the combination of strength of members in frames, and that the maximum required ductility of each members can be expressed as a simple relation in terms of the required cumulative ductility.
View full abstract
-
Kenji YONEZAWA, Hideaki YOSHIKAWA, Toshiki OHYA, Hiroshi NOGUCHI
Article type: Article
1994 Volume 59 Issue 460 Pages
179-189
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
Steel plates enclosed by spiral reinforcement are used as both roles of longitudinal bars and shear reinforcement in reinforced concrete members. Tliis reinforcing system is named "plate reinforced concrete structure (PLRC)". In the previous experiment, crossed section columns using this structural system had been recognized to have excellent ductility. The 2-D non-linear finite element analysis was performed in order to investigate the shear resistant mechanisms of crossed section columns of PLRC. From the analysis, it was found that modelling the stress transfer mechanisms between concrete and plates with linkage elements can lead to the way to describe the behavior of the columns. Finally, the numerical tests were performed for the role of a tieplate which connected plates. It was shown that the shear resistant mechanisms of the columns consisted of an arch-action and a sub-strut-action in concrete, in addition to the shear resistance of steel plates.
View full abstract
-
Mamoru IWATA, Masanori FUJITA, Masako YONEDA, Akira WADA
Article type: Article
1994 Volume 59 Issue 460 Pages
191-200
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
System truss is suitable for various type of large span structures. When an architect designs system truss having a curved surface, the sorts of members and joints vary so greatly. This paper focused on the information flow and product implementation. Production information which is transmitted into the factory, is used to fabricate components which then become unnecessary at the next step. Product information into the site is as well, we examine quantitatively how soft information is transformed into a hard object such as structural element, or structure. Soft information plays a more important role than a hard object in the systematized production process. Computer technologies enable the production of structural components of many sizes in small lots economically and efficiently.
View full abstract
-
Article type: Appendix
1994 Volume 59 Issue 460 Pages
App21-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1994 Volume 59 Issue 460 Pages
Cover18-
Published: June 30, 1994
Released on J-STAGE: January 27, 2017
JOURNAL
FREE ACCESS
